[ Problem Point ]
Heat ran away from the furnace,was the problem of quenching quality.
[ ⇒Kaizen Point ]
The furnace was air sealed with the Air Blow Heater.
The temperature of the interior was kept,and the quality of quenching has improved.
Related page:
No.47 Replacement of gas in laboratory electrified 
No.65 Small high-temperature tunnel furnace heat source 
No.67 Concentration apparatus using nitrogen gas 
No.68 Manufacturing of dryness steam of electric boiler 
No.71 Manufacturing of superheated steam 
No.4 Film shrink 
No.5 Heat-shrinkable tubing 
No.8 Dryness of print